KEEL COOLED 1. The supply pipe to the keel cooler should be 22mm bore and the return 22mm bore.
IDEAL KEEL COOLING TANK
2. The tank size should have a surface area (x) exposed to the sea water or canal water of (0.25 x the bhp of the engine) = sq ft of cooling area required. For canal boats this should be adequately baffled and a vent provided to expel any air. The supply (hot water) goes in at the top of the tank and the return comes out of the bottom. Also refer to cooling tank notes on page 10.
(1)
Air bleed valves
the water over the cool outer surface. (3) Air bleed valves should be fitted both ends.
Baffle continuously welded to outer skin and close fitting on inner skin. (2) The tank should be thin in section to allow good mixing of
CALORIFIER SYSTEM All Beta engines can be fitted with the engine tappings to allow the hot water from the closed fresh water/antifreeze system to circulate through a calorifier tank which in turn heats up domestic water. Calorifier tappings on this range of engine are shown below.
1. The big problem with a calorifier is to remove all the air from the system. If this is not achieved then they don’t work! 2. Try and keep the supply and return pipes a and b either horizontal or sloping down in a continuous fall. This avoids air pockets being created.
3. Extra care must be taken when first filling the calorifier circuit system with 50% antifreeze to water solution as the engine may appear to be full but it soon disappears into the calorifier pipe work. Run the engine off load for 10 minutes then check the level as described in ‘Filling The Fresh Water System’. Keel Cooled Version
Heat Exchanger Version
a
a
b
b
Also check to see if the pipe going to the calorifier is getting warm after 15 minutes.Top up the water level as required and run for another 10 minutes then repeat. 4. If the water level is steady but no warm water is getting to the
calorifier then very carefully open the calorifier bleed valve (see manufacturers instructions) or if none is provided then very carefully loosen the jubilee clip securing the supply pipe to the calorifier . Air should escape. Refasten securely when no further bubbles are seen.
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CAUTION Do not do this when the engine is hot as scalding hot water may be forced out of the pipe under pressure.
